TOC Page | 104 Cypripedium parviflorum Salisb. var. pubescens (Willd.) Knight Yellow Lady's Slipper Family: Orchidaceae Synonyms: Cypripedium calceolus L. var. pubescens (Willd.) Correll Cypripedium pubescens Willd. var. pubescens NESL Status: G4 Federal Status: None Plant Description: Plants erect, often forming clumps with several stems, 30–40 cm tall. Stems and leaves sparsely pubescent to glandular, with 2 sheathing bracts below the 3-4 alternate lanceolate to elliptic, somewhat acuminate leaves, leaves 5 – 15 cm long. Flowers mostly solitary, often exceed by an erect leaf-like bract; sepals and petals greenish or yellowish or more often purplish-brown dorsal sepal suborbiculate or ovate to ovate-lance-acuminate, 19–80 × 7–40 mm; lateral sepals connate; 11–80 × 5–34 mm; petals horizontal to strongly descending, same color as sepals, commonly spirally twisted or undulate, sometimes flat, linear-lanceolate to lance-ovate or oblong, 24–97 × 3–12 mm; lip rather pale to deep yellow, very rarely white, rarely with reddish spots or suffusion on adaxial external surface, 15–54 mm; orifice basal; staminode cordiform-ovoid, deltoid, lance-ovoid, or ovoid-oblong. Flowers from late May to June. Similar species: This is the largest and showiest orchid known from the Navajo Nation and not easily confused with any other species. Habitat: In moderate shade along streambanks, mountain meadows and mesic places in Ponderosa pine, mixed conifer and aspen forest communities. On the Navajo Nation known from above 7000ft Distribution: North America. Navajo Nation Distribution: Only known from historic records near Toadlena, San Juan County, NM. Potential Navajo Nation Distribution: Chuska Mountains Survey Period: During the flowering/fruiting season from late May through June Avoidance: A 200 ft buffer zone is recommended to avoid disturbance; may be more, depending on size and nature of the project. Any activity impacting groundwater will need special consideration. References: Coleman, R.A. 2002. The Wild Orchids of Arizona and New Mexico. Cornell University Press, Ithaca NY. McDougall, W.B. 1973. Seedplants of northern Arizona. The Museum of Northern Arizona, Flagstaff. Kearney, R.H. and T.H. Peebles. 1960. Arizona Flora (with supplement). University of California Press, Berkeley. Daniela Roth. 2008. Species account for Cypripedium parviflorum var. pubescens. Navajo Natural Heritage Program, P.O. Box 1480, Window Rock, AZ 86515. Additional copies at http://nnhp.nndfw.org/ .